Hungry people do get irritated and angry more than others.

Hunger is indeed associated with irritability and anger. Up to 56% of the variability of these emotions during the day can be explained precisely by an empty stomach. These conclusions were made by British and Austrian scientists during a study involving 64 people. For three weeks, five times a day, they entered data on the feeling of hunger and emotional state into the application on the smartphone. In total, scientists analyzed about nine thousand records. They showed that feeling hungry is associated with more negativity and less satisfaction.